21004646433 has 16 divisors (see below), whose sum is σ = 29484755520. Its totient is φ = 13264045056.

The previous prime is 21004646389. The next prime is 21004646473. The reversal of 21004646433 is 33464640012.

It is not a de Polignac number, because 21004646433 - 2¹³ = 21004638241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21004646394 and 21004646403.

It is not an unprimeable number, because it can be changed into a prime (21004646473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 400341 + ... + 449757.

It is an arithmetic number, because the mean of its divisors is an integer number (1842797220).

Almost surely, 2^21004646433 is an apocalyptic number.

It is an amenable number.

21004646433 is a deficient number, since it is larger than the sum of its proper divisors (8480109087).

21004646433 is a wasteful number, since it uses less digits than its factorization.

21004646433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56896.

The product of its (nonzero) digits is 41472, while the sum is 33.

The spelling of 21004646433 in words is "twenty-one billion, four million, six hundred forty-six thousand, four hundred thirty-three".